Information about the discontinuation
of ISDN calling by the 31.12.2017.
Be ready for the communication of the future!
Conventional landline calling is slowly but surely being replaced by IP calling (VoIP). Therefore, Swisscom has
decided to discontinue traditional ISDN (TDM) calling by 31.12.2017. For you, this means that all communication
services in the future will operate exclusively through the IP network.
Business Sunrise is already using VoIP-based connection products. This means that connection via IP to our
customers’ locations is being set up. This VoIP connection can then be set up on-site with appropriate terminals
(CPEs) as a VoIP (SIP trunk) or as an ISDN (BRI or PRI) on the telephone system. As an alternative to connecting the
telephone system on-site, we also offer cloud-based calling solutions.
With Business Sunrise, you will have no problems once traditional ISDN/TDM calling is discontinued, and you can
decide for yourself at any time when you would like to switch to the world of Voice over IP (VoIP).
1. What solutions are available?
Basically, all modern calling solutions – regardless of whether they use an on-site telephone system or a cloud
solution – are based on the Voice-over-IP standard.
Solutions via VoIP
Business voice direct
Connecting the telephone system
via a VoIP connection using a SIP trunk
(up to 120 voice channels)
IP PBX
IP
Router
IP
Business cloud PBX
Telephone system from the
cloud and connection via
Internet
PSTN
Switch
PSTN/IP
LAN
cloud PBX
Plattform
IP PBX
IP
Router
IP
Switch
PSTN/IP
LAN
ISDN PBX
ISDN
Gateway
IP
ISDN with VoIP Gateway
(up to max. 14 BRI or 6 PRI)
ISDN PBX
ISDN
Gateway
IP
Router
IP
Switch
PSTN
Internet
Router
IP
Switch
PSTN
Router
1.1. Companies with one phone system
Companies with one phone system can easily port their telephone line to Business Sunrise. The existing phone
numbers are retained and the existing ISDN telephone system can continue to be used. This also applies if the
change is made at a later date. Of course, new IP telephone systems can immediately be connected via SIP trunk.
As an alternative, the telephone system can be replaced by a cloud solution (Business cloud PBX). In this case, all
that’s needed is an Internet connection with sufficient bandwidth for making calls.
1.2. Companies with no phone system
Companies using the traditional ISDN multiline or EconomyLine connections must adapt their infrastructure in the
future to IP-based solutions. Business Sunrise already offers an appropriate solution for this. The existing phone
numbers can be retained. But the ISDN telephones must be replaced with IP telephones. The connection to the
public telephone network is established via the Internet.
2. What happens with the special solutions?
Many companies are using analog EconomyLine connections for alarm systems, elevator phones, fax and modem
applications. However, analog telephone lines will no longer be available anywhere in Switzerland as of
31.12.2017. Therefore, we recommend that these companies start thinking now about an appropriate change in
technology and seek advice from us regarding the best possible customized solutions.
2.1. Elevator phones
For elevator phones, we recommend switching to mobile network-based systems. These solutions are well-proven
in practice and are offered by all the leading elevator manufacturers. By accessing multiple mobile base stations,
the redundancy of the connection increases, particularly in inner city areas. In exceptional cases where there is
insufficient in-house mobile network coverage, we will work together with you to find an appropriate solution.
2.2. Alarm systems
Alarm systems that currently transmit their alarms via analog or ISDN connections must be converted to IP-based
solutions by 31.12.2017. The alarm system manufacturers have appropriate solutions for this.
•
andline IP/Mobile redundancy: The best solution. A simultaneous landline IP and mobile connection is
L
more secure than the existing landline solution via ISDN or analog connection.
•
Mobile network connection: In most cases, a simple transmission via mobile network is sufficient. Many
alarm systems are already set up for this type of alarm. No additional installation is required.
•
andline IP connection: In most cases, simple transmission via landline IP meets the requirements. ConsiderL
ing the emergency power supply for the router, this type of transmission corresponds to today’s transfer via ISDN
or analog connection. Many alarm systems can be relatively easily converted to IP.
•
nalog-IP converter/modem over VoIP: From a purely technical point of view, solutions in which the
A
alarm systems’ analog signal is converted into a VoIP signal are also possible. But a secure transmission cannot be
guaranteed. Therefore, we do not recommend this option.
2.3. Modem applications
Many applications still communicate via modems, which convert signals into speech. Switching to IP therefore
makes sense and is more efficient in this case. We recommend that you contact the suppliers of these systems as
quickly as possible and seek advice about appropriate solutions. Connecting the modem by means of a converter
to the IP network is not supported by Business Sunrise, since we cannot guarantee error-free transmission.
2.4. Fax
Analog fax services will disappear from the market over the medium to long term. These services are gradually
being replaced by IP-based solutions such as eFax (fax via PC) or e-mail. Basically, analog fax machines can
continue to be used in an IP environment via analog IP converter. However, fax services in an IP environment do
not achieve the same reliability as in the analog world. Therefore, the error-free operation cannot be 100%
guaranteed in each case. In general, we recommend the following with the integration of existing fax machines via
analog-IP converter:
• turning off the error correction mode on the fax machine
• reducing the transmission speed on the fax machine (max. 9600 bps)
3. Power supply for IP solutions
Unlike traditional ISDN or analog connections, IP connections always require an additional power supply. The power
autonomy that exists today with Swisscom with the traditional ISDN and/or analog connections can no longer be
guaranteed with IP solutions. This means that the Internet router must be protected in the event of a power failure
by means of an emergency power supply. Business Sunrise is currently reviewing the use of compact CPEs with an
independent battery power supply in order to bridge any short-term interruptions in the Swiss power grid.
Do you have any other questions? If you require any further information, just give us a call.
Infoline 0800 555 552
www.business-sunrise.ch
02.2016
Sunrise Communications AG
Business Customers
Binzmühlestrasse 130
CH-8050 Zurich